Zero-shot text classification API: route text into your own labels

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Zero-shot classification: give text and 2-20 candidate labels, get the best label, a short reason and a ranking. Use for routing tickets, tagging content, intent detection and moderation queues.

When to use it

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

Text to classify, up to 8,000 characters
Comma-separated candidate labels (2-20)

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
text (required)stringText to classify, up to 8,000 characters
labels (required)stringComma-separated candidate labels (2-20)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/ai/classify?text=My%20card%20was%20charged%20twice%20for%20the%20same%20order.&labels=billing%2Cshipping%2Ctechnical%2Cother"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/ai/classify?text=My%20card%20was%20charged%20twice%20for%20the%20same%20order.&labels=billing%2Cshipping%2Ctechnical%2Cother&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "label": "billing",
  "reason": "The customer reports a duplicate charge.",
  "ranking": [
    "billing",
    "other",
    "technical",
    "shipping"
  ],
  "model": "@cf/meta/llama-3.1-8b-instruct-fp8"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ai_classify, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

Do I need to train anything?

No. It is zero-shot: send the text (up to 8,000 characters) and the comma-separated labels.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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